Amphiphilic Conjugated Block Copolymers: Synthesis and Solvent-Selective Photoluminescence Quenching

Authors

  • Guoli Tu Dr.,

    1. Makromolekulare Chemie and Institut für Polymertechnologie, Bergische Universität Wuppertal, Gauss-Strasse 20, 42097 Wuppertal, Germany, Fax: (+49) 202-439-3880
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  • Hongbo Li Dr.,

    1. Fachbereich Elektrotechnik, Informationstechnik, Medientechnik, Lehrstuhl für Elektronik and Institut für Polymertechnologie, Bergische Universität Wuppertal, Rainer-Gruenter-Strasse 21, 42119 Wuppertal, Germany
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  • Michael Forster Dr.,

    1. Makromolekulare Chemie and Institut für Polymertechnologie, Bergische Universität Wuppertal, Gauss-Strasse 20, 42097 Wuppertal, Germany, Fax: (+49) 202-439-3880
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  • Ralf Heiderhoff Dr.,

    1. Fachbereich Elektrotechnik, Informationstechnik, Medientechnik, Lehrstuhl für Elektronik and Institut für Polymertechnologie, Bergische Universität Wuppertal, Rainer-Gruenter-Strasse 21, 42119 Wuppertal, Germany
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  • Ludwig J. Balk Prof.,

    1. Fachbereich Elektrotechnik, Informationstechnik, Medientechnik, Lehrstuhl für Elektronik and Institut für Polymertechnologie, Bergische Universität Wuppertal, Rainer-Gruenter-Strasse 21, 42119 Wuppertal, Germany
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  • Reinhard Sigel Dr. ,

    1. Max Planck Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg 1, 14476 Golm, Germany
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  • Ullrich Scherf Prof.

    1. Makromolekulare Chemie and Institut für Polymertechnologie, Bergische Universität Wuppertal, Gauss-Strasse 20, 42097 Wuppertal, Germany, Fax: (+49) 202-439-3880
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  • We would like to thank the CAS/MPG programme for a postdoctoral fellowship for G.T. and the Volkswagen Foundation for financial support (joint collaborative projects of science and engineering).

Abstract

A novel, amphiphilic, conjugated block copolymer is described, which was prepared by a Suzuki-type cross-coupling of 2-bromo-[9,9-bis(2-ethylhexyl)fluorene]-7-pinacolato boronate as an AB-type monomer and monobromo-substituted poly[3-(6-bromohexyl)thiophene] (Br-P3BrHT) as a polymeric end capper in the key step. PF-P3PHT (P2; PF=poly(9,9-dialkylfluorene); P3PHT=poly[3-(6-diethylphosphonato-hexyl)thiophene]) as the amphiphilic target polymer was then generated in a polymer-analogous conversion of the alkyl bromide side chains of the PF-P3BrHT (P1) precursor into polar alkyl phosphonate groups by reaction with triethyl phosphite. P2 shows a strong influence of the solvent polarity on the optical spectra (absorption, emission). Treatment of solutions of P2 in tetrahydrofuran (THF), a nonselective solvent, with increasing amounts of solvents that are selective for the polar polythiophene blocks (water) or the nonpolar polyfluorene blocks (hexane), respectively, results in the formation of two different types of core–shell aggregates, which show rather different optical properties (photoluminescence quenching, excitation energy transfer).

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